If your fish appear to have health problems, it can often be difficult to work out exactly what it is they are suffering from, particularly as many remedies are solely for fungi or parasites ot bacteria, so you end up unsure which one to spend your money on.
That's where Medifin comes in, because it is a cure-all, it treats all of the above in one go, and so far for me it has always been effective.
All you have to do is add 10 ml to each 230 litres [50 gallons] of pond water, and the top of the screw cap is made specially as a 10 ml measure. You re-treat after 7 days if necessary.
The liquid is blue and will darken your pond water for 3 or 4 days. Don't get it on anything, including your fingers, as it is virtually indelible.
On the back of the container it reads, "Refer to instruction label before use." Many users probably assume their instructions have been omitted, but rather bizarrely you must peel back the label from its lower right-hand corner and, hey presto, the instructions are underneath it!